class 9 chapter 8 newton law of motion objective question

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NEET /JEE LEVEL QUESTIONS

Higher thinking question

1.    Which would required a greater force ,accelerating a 2kg mass at 5ms-2 or a 5kg mass at 3 ms-2

                                                                                                                                 Answer 5kg

2.    Prove with the help of laws of motion that total momentum of two objects is conserved during collision provided no external forces acts .

3.    State three law of motion?

4.    Drive an expression for calculation of force.

5.    When a person jumps out of  a boat ,the boat moves backward .explain why?

6.    Why no force is required to move an object with a constant velocity ?

7.    All car provided with seat belts give reason?

8.    If some force acts on a body ,what will happen to acceleration of the body when its mass is

a.    Doubled

9.    A girl of mass 50kg jumps out of a boat of mass 300kg with horizontal velocity of 3 ms-2 .with what velocity does the boat begin to move backwards ?      answer 0.5m/s         

10.A car of mass 1800kg ,moving with a speed of 10ms-1 is brought to rest after covering a distance of 50 m. calculate the force acting on the car .              answer -1800N

 

 

 

 

 

 

 

 

 


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